package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void addCart(ShoppingCartDTO dto) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(dto, shoppingCart);

        shoppingCart.setUserId(BaseContext.getCurrentId());
        ShoppingCart cart = shoppingCartMapper.selectBy(shoppingCart);
        if (cart == null) {
            if (dto.getDishId() != null) {
                Dish dish = dishMapper.getById(dto.getDishId());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                Setmeal setmeal = setmealMapper.getById(dto.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCart.setNumber(1);

            shoppingCartMapper.insert(shoppingCart);
        }else {
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.update(cart);
        }
//        ShoppingCart shoppingCart = new ShoppingCart();
//        BeanUtils.copyProperties(dto, shoppingCart);
//        //只能查询自己的购物车数据
//        shoppingCart.setUserId(BaseContext.getCurrentId());
//
//        //判断当前商品是否在购物车中
//        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
//
//        if (shoppingCartList != null && shoppingCartList.size() == 1) {
//            //如果已经存在，就更新数量，数量加1
//            shoppingCart = shoppingCartList.get(0);
//            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
//            shoppingCartMapper.update(shoppingCart);
//        } else {
//            //如果不存在，插入数据，数量就是1
//
//            //判断当前添加到购物车的是菜品还是套餐
//            Long dishId = dto.getDishId();
//            if (dishId != null) {
//                //添加到购物车的是菜品
//                Dish dish = dishMapper.getById(dishId);
//                shoppingCart.setName(dish.getName());
//                shoppingCart.setImage(dish.getImage());
//                shoppingCart.setAmount(dish.getPrice());
//            } else {
//                //添加到购物车的是套餐
//                Setmeal setmeal = setmealMapper.getById(dto.getSetmealId());
//                shoppingCart.setName(setmeal.getName());
//                shoppingCart.setImage(setmeal.getImage());
//                shoppingCart.setAmount(setmeal.getPrice());
//            }
//            shoppingCart.setNumber(1);
//            shoppingCart.setCreateTime(LocalDateTime.now());
//            shoppingCartMapper.insert(shoppingCart);
//        }
    }

    @Override
    public List<ShoppingCart> list() {
        return shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());
    }

    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO dto) {
        //查询当前菜品或套餐是否在购物车中
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(dto, shoppingCart);

        ShoppingCart cart = shoppingCartMapper.selectBy(shoppingCart);
        //如果不在，则抛出业务异常
        if (cart == null) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPINGCART_ERROR);
        }else {//如果在，则修改其数量
            //如果数量为1，则删除该菜品或套餐
            if (cart.getNumber() == 1) {
                log.info("删除购物车中的菜品或套餐：{}", cart);
                shoppingCartMapper.deleteById(cart.getId());
            }else {//如果数量不为1，则修改其数量
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.update(cart);
            }
        }
    }
}
